// Copyright 2016 The Go Authors. All rights reserved.// Use of this source code is governed by a BSD-style// license that can be found in the LICENSE file.// Package plugin implements loading and symbol resolution of Go plugins.//// A plugin is a Go main package with exported functions and variables that// has been built with://// go build -buildmode=plugin//// When a plugin is first opened, the init functions of all packages not// already part of the program are called. The main function is not run.// A plugin is only initialized once, and cannot be closed.//// Currently plugins are only supported on Linux and macOS.// Please report any issues.package plugin
// Plugin is a loaded Go plugin.type Plugin struct {
pluginpath string
err string // set if plugin failed to load loaded chan struct{} // closed when loaded syms map[string]interface{}
}
// Open opens a Go plugin.// If a path has already been opened, then the existing *Plugin is returned.// It is safe for concurrent use by multiple goroutines.func Open(path string) (*Plugin, error) {
return open(path)
}
// Lookup searches for a symbol named symName in plugin p.// A symbol is any exported variable or function.// It reports an error if the symbol is not found.// It is safe for concurrent use by multiple goroutines.func (p *Plugin) Lookup(symName string) (Symbol, error) {
return lookup(p, symName)
}
// A Symbol is a pointer to a variable or function.//// For example, a plugin defined as//// package main//// import "fmt"//// var V int//// func F() { fmt.Printf("Hello, number %d\n", V) }//// may be loaded with the Open function and then the exported package// symbols V and F can be accessed//// p, err := plugin.Open("plugin_name.so")// if err != nil {// panic(err)// }// v, err := p.Lookup("V")// if err != nil {// panic(err)// }// f, err := p.Lookup("F")// if err != nil {// panic(err)// }// *v.(*int) = 7// f.(func())() // prints "Hello, number 7"type Symbol interface{}